Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a793774abafcb4…

MALICIOUS

PDF

86.0 KB Created: 2021-03-25 14:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6070a921b652e33ef147f5dd26b422b1 SHA-1: 546650f10da8768e8db1b8074c823019a17b8371 SHA-256: 63a793774abafcb4a9ed729a1c1f7d80a4fcb4c961926c079cb8be1e498ae8aa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=discovering+economic+systems+comparative+worksheet PDF link annotation
    • http://sofebitaxed.iblogger.org/articles_in_english_grammar_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/pgi1jak/plastic_female_mannequin_head_for_sale.pdfIn PDF document text
    • http://tujofuzenej.iblogger.org/intoxicacion_barbituricos.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/3jhNq3q/dikerofuxiginumuxigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/hindu_wedding_ceremony_template.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_60dc62e8156d409890c42c3c36c1fd02.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_2d9680f8406b4c5985ab3970fc7b642c.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_eb2900c7a99b410d9aa15c4020dbea41.pdf?index=trueIn PDF document text
    • http://rokosarod.rf.gd/present_continuous_tense_exercises_for_beginners.pdfIn PDF document text
    • http://serimaziwexibov.epizy.com/what_are_the_different_production_processes.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_48cb53fcb57b4369bb9a5739f7826d5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/how_to_draw_a_cartoon_turkey_art_hub.pdfIn PDF document text
    • http://tutonewi.epizy.com/criticism_of_behaviorism.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_ddf7268e65924139ae69bcbaa6f6da00.pdf?index=trueIn PDF document text
    • http://tolisukik.epizy.com/newukarasizomapidofa.pdfIn PDF document text
    • http://jebunojas.epizy.com/99307598967.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_dc1e7f32aa8145489360fb195a7f8086.pdf?index=trueIn PDF document text
    • http://riwexakax.epizy.com/structure_and_function_of_prokaryotic_and_eukaryotic_cells.pdfIn PDF document text
    • http://lojizaruxaz.rf.gd/57878478517.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/81595734027.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 5632 bytes
SHA-256: 127237479d5878e8666c9890ae9e8b3283b8edccef90369418ccdf38ff8eb436
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 11368 bytes
SHA-256: eddd53a7a80c3dd25d9dc542a2841254012648a5241db4db0edd546401028340
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90